iDatalink ACC-RCA1 RCA1 RCA adapter for DSP harnesses This T-harness to RCA adapter and data extension cable kit is compatible with the Maestro AR and our selection of DSP harnesses. It converts the signal of the DSP T-harness connector to RCA outputs to facilitate the installation of an aftermarket remote amplifier or processor while retaining amazing sound. It features a 4-pin data extension cable and a wide range of data and analog firmware applications to accommodate all your needs.